Seven-Star Isles
From The Wind Waker Randomizer
Seven-Star Isles has seven rock pillars with 3 platforms, a Big Octo, and sunken treasure.
Platforms
To the south of the rock pillars, there are three platforms that will each spawn a chest when the Wizzrobes are defeated. In the vanilla game, these chests contain a Red Rupee (20), a Golden Feather, and a Treasure Chart.
Big Octo
The 12-eyed Big Octo is located near the rock pillars and guards a Piece of Heart in the vanilla game.
Sunken Treasure
This treasure can be located by deciphering and opening Triforce Chart 7. This chest contains a Triforce Piece in the vanilla game.